I understand the suspicion of “magic foods” — but let’s remember oil of foxglove (digitalis), cinchona bark (quinine), willow bark tea (acetasalicylic acid, aspirin), poppies (opiates), and coca (cocaine). There may be something in green tea that we can isolate and enhance to treat Alzheimer’s disease, and that would be a boon.
The other side of my list might be raspberry ketones, green coffee bean, hoodia, echinacea, acai…I’m amused by the ads that want to combine a holistic-homeopathic flavor with the aura of science.

Howdy Kenw
That’s my chief obstacle in “medical” marijuana. The plants have a huge range of THC content, the different dosing mechanisms will deliver that varying dose in varying ways, and those who are smoking it would vary their dosing even more. Legalize or don’t, in my opinion, but a little rigor does matter.
If there’s something useful in green tea, it should be possible to isolate it and establish a treatment protocol better than “three sips in the morning.” I’ve seen a lot of “emerging science” (as one commercial put it) that submerged shortly after. That one was lycopene.